code: def _test_prec(items, rel, **k):
      recs = pd.DataFrame({"item": items})
      truth = pd.DataFrame({"item": rel}).set_index("item")
      return precision(recs, truth, **k)
  
file_path: lkpy/tests/test_topn_precision.py
imports: import numpy
  import pandas
  from pytest import approx
  from lenskit.topn import precision
  from lenskit.util.test import demo_recs
  from lenskit import topn
label_desc: Use image node_id 1 for calling a global function with example usage: _test_prec(items, rel) and returns: precision